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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '431385725b5952d4fae8f5dcb5c9d1ad5335f152569dd1cf2898cfb34fb00067' 
  AND token = 'jqd1nuFNY7QA13sBm0IaLZe0uYwxjbHtpNCH49ucoa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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