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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc94f1ee5b05d4352030b7706a407c7ce3df1e3789234f23547931bf9dd303c' 
  AND token = 'ZQfm0Hx/LorR5nzAOKSg2VApVZe4xQCr3tuXGdz7LiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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