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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7cdcf506032002f2db7b403d7a1d9340cbadad45a7a71160c61292157964811' 
  AND token = 'acTqVip6PKt2lJd43Wsr6MO36YPw68PyxijG6vX5kvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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