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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31141b70c90ff0636488dae4815c881003c6f670aff076f34a8800c2f715b5b7' 
  AND token = 'NuYIGJLY/VF7BrFUAdlENVQT37AWs0gLiBNIUqYmZAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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