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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198f622d19460d4462e538f45041896a729154f586235f8429e876057b523e5b' 
  AND token = 'fvWDxc1wboBqdl61q0h0C/auN3GAPoXt/r45OAfLRfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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