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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '881a132a5a800d8bbdeb50c7f51eeedd6be7170749e01d8d8727f12dbd84c4e3' 
  AND token = 'exQl4LKbl6wOjvEY14T0Wb8sW+rLdmaGNq475eI9ors=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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