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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7b2ec0a099e4e75b3e6ccc6400299d84dd74619538462a5e16ce338f0296f07' 
  AND token = '3XUYUFx5EjTSHpUuo04fZ3nWAwTaYaZs7sFHN5HX5KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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