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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c7d94915fa621ca9d6cc8a2e7f250124c5ec61e3994f7689dff9a512e0b9857' 
  AND token = 'yknPButfNk/o+685tlQ0CXLjr6vOeYIU+rZK/TaGQcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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