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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e991da5fac27d0416fe7a60dcbc9c478009d864ef83f192ba173d7be7fdba0' 
  AND token = 'NTf/AAILC2Kn6EctHxfp3nBJH8Wd2wYygf2zft472gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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