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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3932714e2c7678e1f327032d351bc76408756d566d70858d9ff5de93c9a35e8a' 
  AND token = '7ImkmY++feCIt1I3VKeTDBQjfYwkkVy79J0KxBP9eHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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