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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16a05b15e078b6c5993f20f1b764a39d660aee871426ec7789b999e93ad8318b' 
  AND token = '94cjj6DczXKJQ86iyrH5lZldScWyM1BUHFzDT4gmizs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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