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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a39edc80ef87dd32ac763b0be2e32faf30d0c9f17d92f9a5a657d974dc4c51fd' 
  AND token = '0NPB7iWnmC64rpskaan1DEAqlQk5dwU02867qHPSwPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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