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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '428e77dc9c6f85c3a4a3d1b1dcfd2d47b3d4f635313efe9d4c3084966cdcf77c' 
  AND token = 'r7Q27JX9ZjZizbPhYYx0TRicu7inmX0xQtbaYOm0BFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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