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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '613ab4f45d425b99725ffa1af5c49a5e86d00107e3bb800d3cabc3a4ca4d6862' 
  AND token = 'jo6ivseaV8khoG0TwUr8Ov8uy3P8U1AonfGIs9Ujd7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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