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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c569eb42425483d0e173942dd1487b9d14ba1f5a062df5de76fc698ab1809ae' 
  AND token = 'BXiC2TWSuO4FUbKayuUtXN91lkBqCG7aLhoixSQU2bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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