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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c15a57394190aca985640986ca463f2ea49de0451a5ef8db5c1cee08d0a0df' 
  AND token = '+BUsCnBBEIHLG8dFtUq0c75xevfmLGFd8T/UDIANa+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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