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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e8fe83a11cc5da255096d76983a779fa2517aadcdfe1d22e2587607b65d38f0' 
  AND token = 'QUsW5eOWfDOKS7iZu7U0/PsykT3rqdfFPC8R9YqqgtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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