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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ceb8fa84bce5aec9de16348214f43c04bfd11af0194ee6fc1396a67195432d' 
  AND token = 'zG1eAuKq+/HU41fmH8fZb2GYbsA6/FbTvQinBE5C8Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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