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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c2d66fe04b04baf0a27ab20be45bbd1ca7e9f4d3ae2f9fd71982d42e0ce9c44' 
  AND token = '6NsSqepJ1ywmRvyRZUECcRIteLDelrtHRAQXlpUsnrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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