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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d38af048e21e92cbc475c3ad70e504678c534f81d2b1c1965e662fa7f9dc9f6' 
  AND token = 'WYjacHLjTKdKkGY0ZO40KuHmoNcrTdIQX1jajnrNU08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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