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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36d4c912d66d72f4dd5f90162a085df8e1d5453476a096ca4c60c1eab2d87cc4' 
  AND token = 'WUDzNwNnfTGLbrqaLv5PTrli0233h9jjIgKSL/m5l6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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