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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73bbdfe897ffdb19f583c2c2c89b6de37091338bbbad89bd2b7e1f70cbe802d2' 
  AND token = '7BIWC31VuMFV7TSUAmGA8k7MBuU5SLH/WSrhM8Ss9RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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