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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b963a5058fd4c751a60152473d62c2ed0827cdfa770c2369732dfe4d51a41e' 
  AND token = '50khvF5hm7X0EKv3C/0FQQqznpDQ/4HUcm7S1Z9QbyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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