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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941542fa40c14c945806ab21189877f55f3968b3a8ae8d8ffe01fcfdb220050b' 
  AND token = '9mrn2BgRnsY0H4SYXeZFuV7KF4S7f8I+5Yix4i/1PDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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