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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b73bd457e8eca05cbc451d8f963b8e812ec8906358e482995c26d3eff081c4db' 
  AND token = '8YGNJGjFpXWxB1rBS9hMr7i900Pr2Qir8WqlI4aoT8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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