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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de65483d38ecfc437198aa9264f10f544f46f48de10777f27d0a326ab2e6d74' 
  AND token = 'G5eRe6IjCHHrzULvuINWo1U0am9olKFTUT2pUS+iKHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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