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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0b68ed1594bae5797249cc138cb06015e1c6df00840de4064d5a706c12d56d2' 
  AND token = 'cA7NmxKtaB5988veFxVkRdgorqYx35LiTV9jj/0XY7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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