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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da5235ee75510d1b721e34e350f8dc339194c4d389f62162d0edfe4cfa55de0' 
  AND token = 'sw/iN5/vdaO8zj5T3ctptypaQLG46/YOxO9EwxYJS1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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