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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca42fd20faffa86fa3c4fae658e27254e705aa873360c422b40d2b0b7289beb0' 
  AND token = 'w5O0w8ax8ZkU7pgpx2yaAdg7h9pXQiznW4Ak/ohybFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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