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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0608a481de0c4104ae1f995d961ca5bd1b32f198e1a386fc2521c71fe451f58' 
  AND token = 'hwI4Zo32H6/PzE1iwkzWPixeyXvf/Ob5+zt9A7vRIKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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