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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e517cb039030af5f706ba519f6021a722dfce20cf0bc54a5a890ea37be8c9ab' 
  AND token = 'N1dPh5/Nu6NyuwCI5tX2G/3ac9j4awfykbmFfGBWvoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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