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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df7243ea9dbd7816d4cd78ceb8e9c9920b8dc5e34e4e046ec26ff1747c47868d' 
  AND token = 'Mua2iW1nHH8ul9OPx9NVmFXHPUb2h/2zjI3D551my8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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