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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '240fb87f0aba3ca1e5293990be5324ac911ca4d9cfcbcae14a2dc4e6d166dbd4' 
  AND token = 'cjjiKTqegg7hPgNBLOlc2Ffe13yO2kgqV6don3diUIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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