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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b80d401fead3d64b6c27afefc5773c8f3aed57a7a7fa039b684f85db65cf0d6' 
  AND token = 'reaHq59nAxYD5c/V0om73zVQKxCH940bTUExXeV8gM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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