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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff7aa71f9af22d26b256cca2a15f6af74283d91599507795764cdb6f0d7745e5' 
  AND token = '/gb/TIlc4fbvpcPCV8fWRJf+tHTrH++H5AmBsCFh9Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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