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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14f7bcb985995fcb6f7b943f0ae3da1ca57be92be02422c4fadaa2c94c8d7580' 
  AND token = 'SKfmLd021x5RjG3Zye8H636rnR/9nu/Fo9HXb0pZGu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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