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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c41d743191c27ad553ccfaba9093e70c87f81b875c81ae96db306c84bd1b3a7' 
  AND token = 'cPFnnjFcPY6YetontQr09tlPVdv3nnkCeNJIi/yiIX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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