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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c40f202bfefc320e87c2923de51cad6c6a60ecd089beb5f1065412b9b348d78' 
  AND token = 'cYTfHcOBi3UWMfDoqQ5j0E9iUWH63w5xvM92dFfr9Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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