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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c6d07c3d2e58740ed8bcd58380549b4e01f13b4ea0fa1139231abca05b48f6e' 
  AND token = 'nQD5acL8+i2onFb18tnas7rMeK/r4rMKUIAIRlmc2cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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