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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '841b491d82ac52de221c67e57afbb81bf4177da302cec4c8cd705be4b4a75844' 
  AND token = 'xPAgtvIankpxQo1j0KzHV/YaFi0CYcBm8fEv1BOD/wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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