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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27678ca2b80f9f3d62208bcefd17eacfc282f660242f71b6332a0f0d643db86c' 
  AND token = '+QGgGNTpYFYOdj6Dc24Tnz9N19J12IarwGmVx9xoC0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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