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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf8720ed0b396aff8ecf106d5fc7170dcfefc0a71579bafcea6a7a8cafb9e376' 
  AND token = 'fjo3nnMUrZ1xXNP6z7Z/k0zyR0U1B+ZovZoAjeJDcZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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