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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03023a544cad08ed9a68eac977eb2925989c4a390f439b369f361feaaa2bb1ee' 
  AND token = 'UnBafK+R1Riy1ljexF+Kp9z9tUjQuK625s+qU3bPB3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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