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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb5597e575e64f74a4073a055c70aa6845cd9a95306d0385c9fe5906504a7db3' 
  AND token = 'MpNmAvJSplKErTbn55cS6WfYF3UNxkrW3SfXbaG1jYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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