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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e7491233c22c2e57afc0ada3ffb7b95d45b24cdd048522ad5e8c5353a07c9c5' 
  AND token = 'm9crnagJvoB7ctD3WAWY9JsA0bm+d0udsa1MCFjz0Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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