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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a86e568f0a8429e83916e87a28fddacb220345141818de7b6a9c00b0676c80' 
  AND token = 'M5ymk/vhFac0e8jdo/VMW7AhAeJNeRB6wb9KUBXTEwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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