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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46402e04d4e43e0c1c0f5d20c40ed17f3d27ed56c16b5df5d2a72400d9cfc551' 
  AND token = 'YuPDFiW7lZoCCnx5JzeYaygCKcb+R/nyZWkKN6uUheo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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