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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64b9c125ad276e24b9e7de074f8cdfe7670e6bf39252f8308203cc2d77857f5c' 
  AND token = 'oqLw88jtJsD2qtXMhoRSZCbKK3hlahj9NbTRgOme9E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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