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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2171067441b8d0830562b21d43742cbda87aa51a05090852f0b8e48245f68c3' 
  AND token = 'Da99+RNzHImGth0YZQbowWwxVQJlBeb6IU5QMn8XQO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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