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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd701a9d233df3739411f5c9fa144b7f170cbaa18c78c3314dd849bf895c66d' 
  AND token = 'YmvkQUtiHhdAimSxgUJTqBEoK3s3jJdnm0NE38HgeRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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