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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a37c8bdf80e03a75375953f3a4f6b5dcb10bf2e30cd3e40ba96e90e07c204aef' 
  AND token = 'VebciIsQNBKoQs5TMjFu5hYRPEJ5bpS55JWWKLb3fYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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