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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a87168d1a041f7e2f5d945a5cbebf4aca4632cd43d555e31769606064b06066a' 
  AND token = 'XL7VbhTKhGUA52sqMFrRBTeNqQka+4pucfENcw0822k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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