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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '957097ac70d678eab482942aafaccbd7e4c2026749a67a9638b2e99a68fccd3a' 
  AND token = 'tCDv8zoFnSXJ4209rb3fRa73K1P+dxACJBG7Kxu6hZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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