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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '686dfed2af2b50a9d00b456a90f9460ab13ca568c4d1119c06a33793262a7c9e' 
  AND token = '6x8QTUGP7PQ2M40yNi+gXNqO3StBuBhCEe0g8ruH51Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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