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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df13dfcf5ce7db3ac767fd8f63fe5edda6349e8fe07a4632e98794cfd7547445' 
  AND token = 'ySvMz7uw1o3Gf0OduMp1PAwusEkmznfKeV3iAwp4uEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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