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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a894402d9da449076eed1e7d719623623dc7754f03f387bef6adbfebb7160d05' 
  AND token = 'KdIEw2CWwTvEEpIdgFECHDg8osSxtxILr4qGlLGbWMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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