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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '399c01362528e46c852d51a7d0cc6ceec1b944ca928cc34a058366f0dc1894eb' 
  AND token = 'kIw/6/F0w/0Xu5tAc1Sh+cqIlLaSs4UUoq/459fOyQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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