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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17498967bf1568bb08e14a69ddafec9a75628fb9591f8acef0e8fbc6f4a2d50b' 
  AND token = 'WATLPBPlXIYVp++T9cI+Xw3265OOd5QozxtTalDHhh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}