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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2674c246ead71aeddfb0e5593a5f1deaecd223791c4ba1b0ffa086e93f65c6' 
  AND token = 'pVP4Mf2nDdfTuDNAH8p+dRdj9ZByRc5UcGo8alSATN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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