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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecfc01adef822e9d03f458c8a76e374acedfc9ee6c5a570203216fd26623fb96' 
  AND token = '98qKsUfjhGv8btBVjpWOjUV1aSubyWLC7uJV0y/eI9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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